docs: Add "What is IDP Authentication: How Identity Providers Secure …

[lukiccd]

…Your Apps"

Related Issue

Link to the Github Issue created for this blog post

Link to Google Doc

TODO

Checklist

• Has cover image been added
• Have all content images been added. Do they render correctly? (aspect ratio etc)
• The code inside code blocks gives no errors
• Check for SEO keyword?
• Added call to action to link to supertokens and to link to other blogs.
• Add reference to how SuperTokens solves this blog's problem (if relevant).

Remaining TODOs

• ...

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[jscyo]

@lukiccd Additionally please co-ordinate with Nevil to start on the blog diagrams